An Adaptive Controller Based on Genetic Algorithm to Mitigate the Oscillations in Power System

The Sub-Synchronous Oscillation (SSO) phenomenon in the power system with compensated transmission line, is maybe occurred. The SSO phenomenon of turbine-generator electromechanical interaction with series capacitor has historically been a terrible problem in power systems. In this paper, an adaptive control method, was used to damp these oscillations. In this control method, the performance of the exciter was improved. By using genetic algorithm and a PID controller, the output voltage of the exciter was controlled adaptively. This new control method is a Model Reference Adaptive Control method (MRAC) based on the combination of PID control and the Genetic Algorithm (GA). Genetic algorithm is employed to find the best values for PID controller´s parameters in a very short time. With this hybrid controller, mitigation of the sub-synchronous oscillations is done better. The results of simulation confirm the effect of this control method.